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This is how to program your 1999 and 2000 Oldsmobile Alero keyless entry remote yourself at home without going to the dealer…

Obtain all remote transmitters
Access the programming connector (a single black wire, located behind the panel in the RH trunk)
Jump programming connector to ground
System should not lock and unlock doors to indicate programming mode is actived
* Press and hold Lock and Unlock buttons (at the same time) on remote for approximately 10 seconds.
* System will lock and unlock indicating remote transmitter programmed
Repeat above * procedure for all other remote transmitters
Remove programming connector wire to exit programming mode
-Any existing remotes not programmed during this procedure will be overwritten
-You can have up to 4 transmitters active at one time on this system